496HOs. Soot and fuel consumption... ECU reprogram?
 

What's the real deal on this? The 100 hour old 496HOs in Monsoon soot the transom something terrible. The port motor burns more fuel than the starboard. I have Mercury factory warranty left for a while. What do I have to do to get these reprogrammed under warranty to correct these issues? Can I pull them and ship them off myself?

Thanks in advance.

Re: 496HOs. Soot and fuel consumption... ECU reprogram?
 

what grade fuel are you running... if i use higher octane than 87 mine turn the transom black .... the higher the octane the sootier the transom...

Don

Re: 496HOs. Soot and fuel consumption... ECU reprogram?
 

There is a recall on them. I went through my dealer though. Call Mercury Marine. Do not put anything higher than 87 octane in these motors. They are designed for 87.

Re: 496HOs. Soot and fuel consumption... ECU reprogram?
 

Well, I just bought the boat, but it has only ever run 87 octane. Thanks guys. Are there any Mercury shops willing to do this via the mail? I can't even get a call back from the mechanics in my area that I would trust.

Re: 496HOs. Soot and fuel consumption... ECU reprogram?
 

Do a search, merc issued a recall on this for a reprogram.

Re: 496HOs. Soot and fuel consumption... ECU reprogram?
 

Around here we cannot get 87 on the water. I have 160hrs on 89 with no problem.